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solugeo: RT @directionsapb: Kenneth Appel, who solved the Four Color Map Problem, Dies at 80 http://t.co/j2M9xLY8VA #cartography #fourcolortheorem #…

solugeo: RT @directionsapb: Kenneth Appel, who solved the Four Color Map Problem, Dies at 80 http://t.co/j2M9xLY8VA #cartography #fourcolortheorem #…

via Twitter / solugeo http://twitter.com/solugeo/statuses/328980908185092096 http://ifttt.com/images/no_image_card.png